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Add custom level

#python   #logging  

Table of Content

Python has six log levels with each one assigned a specific integer indicating the severity of the log:

  • NOTSET=0
  • DEBUG=10
  • INFO=20
  • WARN=30
  • ERROR=40
  • CRITICAL=50

using setLevel method on logging and handlers we can control/filter the output logging severity

Demo#

custom_level.py
import logging

#create new log level
LOG_LEVEL_CLIENT = 21
logging.CLIENT = LOG_LEVEL_CLIENT 
logging.addLevelName(logging.CLIENT, "CLIENT")

#create logger with "mylogger"
logger = logging.getLogger("mylogger")
logger.setLevel(logging.DEBUG)

#create console handler and set level to debug
handler = logging.StreamHandler()
handler.setLevel(logging.INFO)
logger.addHandler(handler)

#create formatter
formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s -%(message)s")
handler.setFormatter(formatter)


logger.debug("this is debug")
logger.info("this is info")
logger.log(logging.CLIENT, "this is client")
logger.warning("this is warning")
logger.error("this is error")
logger.critical("this is critical")
Result
2022-11-26 06:44:19,616 - mylogger - INFO -this is info
2022-11-26 06:44:19,616 - mylogger - CLIENT -this is client
2022-11-26 06:44:19,616 - mylogger - WARNING -this is warning
2022-11-26 06:44:19,616 - mylogger - ERROR -this is error
2022-11-26 06:44:19,616 - mylogger - CRITICAL -this is critical

setLevel

The above example setLevel method set to severity output to Info
No DEBUG logging is “print”